Loading...
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
4 * Keerthy <j-keerthy@ti.com>
5 *
6 * Based on the LP873X driver
7 */
8
9#include <linux/gpio/driver.h>
10#include <linux/module.h>
11#include <linux/platform_device.h>
12#include <linux/regmap.h>
13
14#include <linux/mfd/lp87565.h>
15
16struct lp87565_gpio {
17 struct gpio_chip chip;
18 struct regmap *map;
19};
20
21static int lp87565_gpio_get(struct gpio_chip *chip, unsigned int offset)
22{
23 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
24 int ret, val;
25
26 ret = regmap_read(gpio->map, LP87565_REG_GPIO_IN, &val);
27 if (ret < 0)
28 return ret;
29
30 return !!(val & BIT(offset));
31}
32
33static void lp87565_gpio_set(struct gpio_chip *chip, unsigned int offset,
34 int value)
35{
36 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
37
38 regmap_update_bits(gpio->map, LP87565_REG_GPIO_OUT,
39 BIT(offset), value ? BIT(offset) : 0);
40}
41
42static int lp87565_gpio_get_direction(struct gpio_chip *chip,
43 unsigned int offset)
44{
45 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
46 int ret, val;
47
48 ret = regmap_read(gpio->map, LP87565_REG_GPIO_CONFIG, &val);
49 if (ret < 0)
50 return ret;
51
52 if (val & BIT(offset))
53 return GPIO_LINE_DIRECTION_OUT;
54
55 return GPIO_LINE_DIRECTION_IN;
56}
57
58static int lp87565_gpio_direction_input(struct gpio_chip *chip,
59 unsigned int offset)
60{
61 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
62
63 return regmap_update_bits(gpio->map,
64 LP87565_REG_GPIO_CONFIG,
65 BIT(offset), 0);
66}
67
68static int lp87565_gpio_direction_output(struct gpio_chip *chip,
69 unsigned int offset, int value)
70{
71 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
72
73 lp87565_gpio_set(chip, offset, value);
74
75 return regmap_update_bits(gpio->map,
76 LP87565_REG_GPIO_CONFIG,
77 BIT(offset), BIT(offset));
78}
79
80static int lp87565_gpio_request(struct gpio_chip *gc, unsigned int offset)
81{
82 struct lp87565_gpio *gpio = gpiochip_get_data(gc);
83 int ret;
84
85 switch (offset) {
86 case 0:
87 case 1:
88 case 2:
89 /*
90 * MUX can program the pin to be in EN1/2/3 pin mode
91 * Or GPIO1/2/3 mode.
92 * Setup the GPIO*_SEL MUX to GPIO mode
93 */
94 ret = regmap_update_bits(gpio->map,
95 LP87565_REG_PIN_FUNCTION,
96 BIT(offset), BIT(offset));
97 if (ret)
98 return ret;
99
100 break;
101 default:
102 return -EINVAL;
103 }
104
105 return 0;
106}
107
108static int lp87565_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
109 unsigned long config)
110{
111 struct lp87565_gpio *gpio = gpiochip_get_data(gc);
112
113 switch (pinconf_to_config_param(config)) {
114 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
115 return regmap_update_bits(gpio->map,
116 LP87565_REG_GPIO_CONFIG,
117 BIT(offset +
118 __ffs(LP87565_GPIO1_OD)),
119 BIT(offset +
120 __ffs(LP87565_GPIO1_OD)));
121 case PIN_CONFIG_DRIVE_PUSH_PULL:
122 return regmap_update_bits(gpio->map,
123 LP87565_REG_GPIO_CONFIG,
124 BIT(offset +
125 __ffs(LP87565_GPIO1_OD)), 0);
126 default:
127 return -ENOTSUPP;
128 }
129}
130
131static const struct gpio_chip template_chip = {
132 .label = "lp87565-gpio",
133 .owner = THIS_MODULE,
134 .request = lp87565_gpio_request,
135 .get_direction = lp87565_gpio_get_direction,
136 .direction_input = lp87565_gpio_direction_input,
137 .direction_output = lp87565_gpio_direction_output,
138 .get = lp87565_gpio_get,
139 .set = lp87565_gpio_set,
140 .set_config = lp87565_gpio_set_config,
141 .base = -1,
142 .ngpio = 3,
143 .can_sleep = true,
144};
145
146static int lp87565_gpio_probe(struct platform_device *pdev)
147{
148 struct lp87565_gpio *gpio;
149 struct lp87565 *lp87565;
150 int ret;
151
152 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
153 if (!gpio)
154 return -ENOMEM;
155
156 lp87565 = dev_get_drvdata(pdev->dev.parent);
157 gpio->chip = template_chip;
158 gpio->chip.parent = lp87565->dev;
159 gpio->map = lp87565->regmap;
160
161 ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
162 if (ret < 0) {
163 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
164 return ret;
165 }
166
167 return 0;
168}
169
170static const struct platform_device_id lp87565_gpio_id_table[] = {
171 { "lp87565-q1-gpio", },
172 { /* sentinel */ }
173};
174MODULE_DEVICE_TABLE(platform, lp87565_gpio_id_table);
175
176static struct platform_driver lp87565_gpio_driver = {
177 .driver = {
178 .name = "lp87565-gpio",
179 },
180 .probe = lp87565_gpio_probe,
181 .id_table = lp87565_gpio_id_table,
182};
183module_platform_driver(lp87565_gpio_driver);
184
185MODULE_AUTHOR("Keerthy <j-keerthy@ti.com>");
186MODULE_DESCRIPTION("LP87565 GPIO driver");
187MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
4 * Keerthy <j-keerthy@ti.com>
5 *
6 * Based on the LP873X driver
7 */
8
9#include <linux/gpio/driver.h>
10#include <linux/module.h>
11#include <linux/platform_device.h>
12#include <linux/regmap.h>
13
14#include <linux/mfd/lp87565.h>
15
16struct lp87565_gpio {
17 struct gpio_chip chip;
18 struct regmap *map;
19};
20
21static int lp87565_gpio_get(struct gpio_chip *chip, unsigned int offset)
22{
23 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
24 int ret, val;
25
26 ret = regmap_read(gpio->map, LP87565_REG_GPIO_IN, &val);
27 if (ret < 0)
28 return ret;
29
30 return !!(val & BIT(offset));
31}
32
33static void lp87565_gpio_set(struct gpio_chip *chip, unsigned int offset,
34 int value)
35{
36 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
37
38 regmap_update_bits(gpio->map, LP87565_REG_GPIO_OUT,
39 BIT(offset), value ? BIT(offset) : 0);
40}
41
42static int lp87565_gpio_get_direction(struct gpio_chip *chip,
43 unsigned int offset)
44{
45 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
46 int ret, val;
47
48 ret = regmap_read(gpio->map, LP87565_REG_GPIO_CONFIG, &val);
49 if (ret < 0)
50 return ret;
51
52 if (val & BIT(offset))
53 return GPIO_LINE_DIRECTION_OUT;
54
55 return GPIO_LINE_DIRECTION_IN;
56}
57
58static int lp87565_gpio_direction_input(struct gpio_chip *chip,
59 unsigned int offset)
60{
61 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
62
63 return regmap_update_bits(gpio->map,
64 LP87565_REG_GPIO_CONFIG,
65 BIT(offset), 0);
66}
67
68static int lp87565_gpio_direction_output(struct gpio_chip *chip,
69 unsigned int offset, int value)
70{
71 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
72
73 lp87565_gpio_set(chip, offset, value);
74
75 return regmap_update_bits(gpio->map,
76 LP87565_REG_GPIO_CONFIG,
77 BIT(offset), BIT(offset));
78}
79
80static int lp87565_gpio_request(struct gpio_chip *gc, unsigned int offset)
81{
82 struct lp87565_gpio *gpio = gpiochip_get_data(gc);
83 int ret;
84
85 switch (offset) {
86 case 0:
87 case 1:
88 case 2:
89 /*
90 * MUX can program the pin to be in EN1/2/3 pin mode
91 * Or GPIO1/2/3 mode.
92 * Setup the GPIO*_SEL MUX to GPIO mode
93 */
94 ret = regmap_update_bits(gpio->map,
95 LP87565_REG_PIN_FUNCTION,
96 BIT(offset), BIT(offset));
97 if (ret)
98 return ret;
99
100 break;
101 default:
102 return -EINVAL;
103 }
104
105 return 0;
106}
107
108static int lp87565_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
109 unsigned long config)
110{
111 struct lp87565_gpio *gpio = gpiochip_get_data(gc);
112
113 switch (pinconf_to_config_param(config)) {
114 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
115 return regmap_update_bits(gpio->map,
116 LP87565_REG_GPIO_CONFIG,
117 BIT(offset +
118 __ffs(LP87565_GPIO1_OD)),
119 BIT(offset +
120 __ffs(LP87565_GPIO1_OD)));
121 case PIN_CONFIG_DRIVE_PUSH_PULL:
122 return regmap_update_bits(gpio->map,
123 LP87565_REG_GPIO_CONFIG,
124 BIT(offset +
125 __ffs(LP87565_GPIO1_OD)), 0);
126 default:
127 return -ENOTSUPP;
128 }
129}
130
131static const struct gpio_chip template_chip = {
132 .label = "lp87565-gpio",
133 .owner = THIS_MODULE,
134 .request = lp87565_gpio_request,
135 .get_direction = lp87565_gpio_get_direction,
136 .direction_input = lp87565_gpio_direction_input,
137 .direction_output = lp87565_gpio_direction_output,
138 .get = lp87565_gpio_get,
139 .set = lp87565_gpio_set,
140 .set_config = lp87565_gpio_set_config,
141 .base = -1,
142 .ngpio = 3,
143 .can_sleep = true,
144};
145
146static int lp87565_gpio_probe(struct platform_device *pdev)
147{
148 struct lp87565_gpio *gpio;
149 struct lp87565 *lp87565;
150 int ret;
151
152 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
153 if (!gpio)
154 return -ENOMEM;
155
156 lp87565 = dev_get_drvdata(pdev->dev.parent);
157 gpio->chip = template_chip;
158 gpio->chip.parent = lp87565->dev;
159 gpio->map = lp87565->regmap;
160
161 ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
162 if (ret < 0) {
163 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
164 return ret;
165 }
166
167 return 0;
168}
169
170static const struct platform_device_id lp87565_gpio_id_table[] = {
171 { "lp87565-q1-gpio", },
172 { /* sentinel */ }
173};
174MODULE_DEVICE_TABLE(platform, lp87565_gpio_id_table);
175
176static struct platform_driver lp87565_gpio_driver = {
177 .driver = {
178 .name = "lp87565-gpio",
179 },
180 .probe = lp87565_gpio_probe,
181 .id_table = lp87565_gpio_id_table,
182};
183module_platform_driver(lp87565_gpio_driver);
184
185MODULE_AUTHOR("Keerthy <j-keerthy@ti.com>");
186MODULE_DESCRIPTION("LP87565 GPIO driver");
187MODULE_LICENSE("GPL v2");